Lightbulb



FIG. 1 is an isometric view, from the top left, of the lightbulb,

FIG. 2 is an isometric view, from the bottom right, of the lightbulb.

FIG. 3 is a plan view from the bottom of the lightbulb.

FIG. 4 is a plan view from the top of the lightbulb.

FIG. 5 is an elevation view from the right side of the lightbulb.

FIG. 6 is an elevation view from the left side of the lightbulb.

FIG. 7 is an elevation view from the front of the lightbulb; and,

FIG. 8 is an elevation view from the back of the lightbulb.

Any broken lines are understood to be for illustrative purposes only and form no part of the claimed design. 

CLAIM We claim the ornamental design for a lightbulb, as shown and described. 